On tlie larval developmout of Amia calva. 671 



Explanatioii of Platcs. 



Piate 9. 



All figures of this plate have been drawn by the autlior from living 



material. 

 Fig. 1. Late embryo, surrounding about 200*' of egg's circum- 

 ference. 138 hours. X about 20. 



Fig. 2. Late emlDryo, surrounding about 225 *• of egg's circum- 

 ference. 142 liours. 



Fig. 3. Late embryo of Fig. 2, shown in a somewhat ventral aspect. 

 Fig. 4. Late embryo, surrounding about 240 ^ of egg's circum- 

 ference. 148 hours. X about 18. 



Fig. 5. Very late embryo, surrounding about 290 ^ of eggs cir- 

 160 hours. X about 20. 

 Larva about time of hatching. 180 hours. 

 Larva of Fig. G, shown in dorsal aspect. 

 Larva of about the beginning of the second day. 

 Larva of about the middle of the third day. 

 Larva of the fourth day. X l^- 

 „ „ „ „ „ Dorsal aspect. 



„ „ „ „ „ Ventral aspect. 



Larva of the fifth day. X 1^- 



„ „ „ „ „ Dorsal aspect. 



au atiditory sac, gs gill slit, h heart, i intestine, l liver, II lateral 

 line, m mouth, n nasal pit, o opercular dermal fold, ol optic lobes, 

 2) pericardium, pc post-cardinal (caudal) vein, pf prouephric duct, pr 

 proctodaeum, pg parietal zone, sd sucking disc, si subintestinal vein. 



Plate 10. 

 Figures 15 — 19 a drawn from the living larvae, 

 Fig. 15. Larva of the sixth day. X l^- 



Fig. 15 a. „ „ „ „ „ Distal view of sucking disc. 



Fig. 16. „ „ „ „ „ Dorsal aspect. 



Fig. 17. Larva of the eighth day. X l^« 

 Fig. 18. „ „ „ „ „ Dorsal aspect. 



Fig. 19. Larva of the tenth day. X l"^- 

 Fig. 19 a. „ „ „ „ „ Jugular region. 



Fig. 19 b. „ „ „ „ „ Sucking disc. 



